Large Mexican sterling silver and black onyx pendant, brooch or pin by Calderon Atachi. This wonderful vintage piece features a large oval black onyx stone in a sterling silver frame that is beaded on the left, with a feather on the right. It can be worn as a pin or pendant. The overall size is 46mm long by 40mm wide. The back is signed Calderon Atachi sterling TC84 Mexico. It is in excellent condition.